1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9572ec8d418d68c63d6498a57c8958fa2c9b9df431cd7bc3159b285dbe5542bb. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/da2b9ef3-4206-4cb6-a082-b2f689c2db11.json and https://artists.proofprofile.net/proofs/artist/da2b9ef3-4206-4cb6-a082-b2f689c2db11.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8960f11c26870e687ebbf65928dc2a1aaa9d1ef851239d135cefac427428e359. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZEQU2250107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d098ede7d4ca01eeede758fa09ab547cf313bb2873ffa560f5463cb3978d86b. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZEQU2250112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14c257401684a89a0bc26b9b18672240906922a373093684842a8081c4ad1a22. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ESA112311551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfbd54bfc470aef069bf2e9f67edb61a5fbc280bbfb5dc02819e84f50ff5fd22. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ESA112320756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc57885baa21143fdadc010982e2aa191c9842439496c0a417dcf8086bdec0bee. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ESA112320757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aef74bdb7332fdc14a0d59580e8ecd853fa73331a9096af4a4f66b1ac2b39df. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ESA112324799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea8ab09728f8646cc9e2dce35b053f3cd51a5966e0db9b2cf6ec853d3c818290. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ESA112428081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cc17116acaf5adb44244698ed9f107b2036c6a45c3a3c00e6bc530b86b24e45. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ESA112431535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93eb132441b519d6bd251e4da8fb11bbd1315d29531a5971783f14b24f48805c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ESA112431539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef5784a90e469c2a9fbb5b9d2170e5a0d84ec57d19a6216db1f8cd1fd9b9df0c. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ESA112451796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31567e43608494ad36c430f666926dc182ebf15ab9cfa9f53233ce2e888267ce. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ESA112558395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x255e8afb91b8832efbde51fe83ea8b39f44158da61f45b4ca3ee3fe1f7e08378. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ESA112580560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf23d5b7fc88e560fd7336254a29a20ce40c20af5ef369983a6ec7e77270e1036. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ESA112580564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7691e127e932220f301a87c3d3a9444f44e988c53da4e053846159a64b882d05. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ESA112580565.